When installing a 1955-62 235 or 1955-63 261 full pressure engine in place of a 1937-54 216 or 235 engine, this conversion allows you to put the early high mount style pump on the later engine.
In the past modifying the 1955-62 water pump was done but required a press to force the hub further back on the shaft, then the hardened shaft required being cut off. Additionally a special pulley and fan was required. After all that the pump and fan still sat 3" lower than the 216 or early 235 pump and that could lead to overheating and possible fan hum.
By using my water pump relocation adapter plate with a 1941-54 water pump, the pump is put back in the stock location. Additionally if you need to replace the water pump in the future you can buy an over-the-counter pump and install it without modification.
Another advantage of using this relocation adapter plate and a stock pump is the stock lower radiator hose can be used. (The modified 1955-62 pump has a larger connection for the lower hose so a special hose is needed.)
Note: When installed in a 1939-40 Chev, the fan will be ¼” forward from stock but will fit fine.
Installation requires drilling and tapping two holes in the engine block.
The carbon in the cast iron keeps the drill bit cool, so no water or lubricant is necessary. Low RPM drilling works best.
Note: I recommend using the harmonic balancer and water pump with the belt width you want from your original engine.
1941-52 ⅝" belt
1953-54 ⅜" belt (An acceptable substitution is to use a 1955-62 truck balancer. It is designed for a ½” belt and may be used with a ⅜" belt. This will allow the belt to run deeper in the groove and in effect will reduce the diameter to very near the correct size).
1937-40 must use one of the above
Caution: I do not recommend using the 1955-62 passenger balancer since the pulley is larger and may turn the fan too fast, leading to cracking. (to identify this balancer, the pulley is 6 3/4" OD X 5/8" outside to outside edge).
Adapter plate $40.00 plus $7.75 FR shipping.
You can PM me if you would like to buy this adapter directly from me, or have any additional questions.
Picture of plate installed.
Last edited by Pre '68 Dave; Thu Feb 13 2020 04:26 PM. Reason: Removed ebay link
...for those interested. I have used Dave's adapter plate on my 1956 261 engine and it is a wise move. Works great on my 261 and as he mentioned, water pumps are available from your local parts house. Works great. Dave, thanks for your work on this.
...and drilling the hole was no problem.
Last edited by Achipmunk; Mon Feb 03 2020 06:14 PM.
The pressed-on cast iron pulley on that 216 style water pump can be modified by machining it to accept a 2-sheave stamped steel pulley for a small block Ford V8. With a 2-groove harmonic balancer from a 250 inline six adapted to the earlier engine, that allows for some creative belt routing for air conditioning, power steering, etc. Jerry
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